body{
  margin:0px;
  padding:0px;
  font-family:sans-serif;
  background-size:cover;
}
.box{
  position:absolute;
  top:50%;
  left:50%;
  transform:translate(-50%,-50%);
  width:450px;
  padding:50px;
  background: rgba(0,0,0,.5);
  box-sizing:border-box;
  box-shadow: 0px 15px 25px rgba(0,0,0,.5);
  border-radius:15px;
}
.box h2{
  margin:0 0 30px;
  padding:0;
  color: #fff;
  text-align:center;
}
.box .inputbox{
  position:relative;
}
.box .inputbox input{
  width: 100%;
  padding:10px 0;
  font-size:16px;
  color:#fff;
  letter-spacing: 1px;
  margin-bottom: 30px;
  border:none;
  border-bottom: 1px solid #fff;
  outline:none;
  background: transparent;
}
.box .inputbox label{
  position:absolute;
  top:0px;
  left:0px;
  padding:10px 0;
  font-size: 16px;
  color:#fff;
  pointer-events:none;
  transition:.5s;
}
.box .inputbox input:focus ~ label,
.box .inputbox input:valid ~ label
{
  top:-18px;
  left:0;
  color:#03a9f4;
  font-size:14px;
}
.box input[type="button"]
{
  margin-bottom: 20px;
  width: 100%;
  background: transparent;
  border:none;
  outline:none;
  font-size: 16px;
  color:#fff;
  background: #03a9f4;
  padding:15px 20px;
  cursor: pointer;
  border-radius:10px;
}